.sk-folding-cube {
  width: 40px;
  height: 40px;
  position: relative;

  -webkit-transform: rotateZ(45deg);
          transform: rotateZ(45deg);
}

.sk-folding-cube > div {
  background-color: initial;
  float: left;
  width: 50%;
  height: 50%;
  position: relative;

  -webkit-transform: scale(1.1);
      -ms-transform: scale(1.1);
          transform: scale(1.1);
}
.sk-folding-cube > div::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: currentColor;

  -webkit-animation: sk-foldCubeAngle 2.4s infinite linear both;
          animation: sk-foldCubeAngle 2.4s infinite linear both;
  -webkit-transform-origin: 100% 100%;
      -ms-transform-origin: 100% 100%;
          transform-origin: 100% 100%;
}
.sk-folding-cube > div:nth-child(2) {
  -webkit-transform: scale(1.1) rotateZ(90deg);
          transform: scale(1.1) rotateZ(90deg);
}
.sk-folding-cube > div:nth-child(4) {
  -webkit-transform: scale(1.1) rotateZ(180deg);
          transform: scale(1.1) rotateZ(180deg);
}
.sk-folding-cube > div:nth-child(3) {
  -webkit-transform: scale(1.1) rotateZ(270deg);
          transform: scale(1.1) rotateZ(270deg);
}
.sk-folding-cube > div:nth-child(2)::before {
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s;
}
.sk-folding-cube > div:nth-child(4)::before {
  -webkit-animation-delay: 0.6s;
          animation-delay: 0.6s;
}
.sk-folding-cube > div:nth-child(3)::before {
  -webkit-animation-delay: 0.9s;
          animation-delay: 0.9s;
}
@-webkit-keyframes sk-foldCubeAngle {
  0%, 10% {
    -webkit-transform: perspective(140px) rotateX(-180deg);
            transform: perspective(140px) rotateX(-180deg);
    opacity: 0;
  } 25%, 75% {
    -webkit-transform: perspective(140px) rotateX(0deg);
            transform: perspective(140px) rotateX(0deg);
    opacity: 1;
  } 90%, 100% {
    -webkit-transform: perspective(140px) rotateY(180deg);
            transform: perspective(140px) rotateY(180deg);
    opacity: 0;
  }
}

@keyframes sk-foldCubeAngle {
  0%, 10% {
    -webkit-transform: perspective(140px) rotateX(-180deg);
            transform: perspective(140px) rotateX(-180deg);
    opacity: 0;
  } 25%, 75% {
    -webkit-transform: perspective(140px) rotateX(0deg);
            transform: perspective(140px) rotateX(0deg);
    opacity: 1;
  } 90%, 100% {
    -webkit-transform: perspective(140px) rotateY(180deg);
            transform: perspective(140px) rotateY(180deg);
    opacity: 0;
  }
}
